[jbossseam-issues] [JBoss JIRA] Closed: (JBSEAM-4032) Page scope throws exception when setting null value

[Norman Richards (JIRA)]

     [ https://jira.jboss.org/jira/browse/JBSEAM-4032?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Norman Richards closed JBSEAM-4032.
-----------------------------------

    Fix Version/s: 2.1.2.CR1
       Resolution: Done


The underlying page context can throw an exception when setting a null value.  I've added a null check.  It's possible that throwing a better exception is in order, but this fix makes the behavior the same as with other contexts that internally convert a set null into a remove operation.

> Page scope throws exception when setting null value
> ---------------------------------------------------
>
>                 Key: JBSEAM-4032
>                 URL: https://jira.jboss.org/jira/browse/JBSEAM-4032
>             Project: Seam
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 2.1.1.GA
>            Reporter: Matthew Lieder
>            Assignee: Norman Richards
>             Fix For: 2.1.2.CR1
>
>
> The following code will cause an unhelpful NPE to be thrown by JSF when the factory is accessed:
> @Name("someComponent")
> @Scope(ScopeType.PAGE)
> public class SomeComponent implements Serializable {
> @Factory("someVar")
> public String getSomeVar() {
> return null;
> }
> }
> While I believe I remember reading that using that particular type of factory method on a page-scoped component isn't supported (supported by the fact that removing the @Scope makes it work), the exception should at least be somewhat helpful in debugging the problem. NPE's with no messages are about as unfriendly as one can get.

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